Desulfurization environment-friendly discharging device of garbage incinerator

Abstract

The utility model discloses a garbage incinerator desulfurization environment-friendly discharge device which comprises a garbage incinerator, a dry type desulfurization tower, a dust remover and a chimney, a flue gas discharge pipe of the garbage incinerator is connected with the dry type desulfurization tower, an outlet of the dry type desulfurization tower is connected with an inlet of the dust remover, and an outlet of the dust remover is connected with the chimney; a high-temperature heat exchanger and a low-temperature heat exchanger are sequentially arranged on a flue gas pipeline between the garbage incinerator and the dry type desulfurization tower, and a branch recirculation pipeline is arranged on a pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger and connected with an inlet of a recirculation fan. And an outlet of the recycling fan is connected with each air chamber arranged on the garbage incinerator. The device has the beneficial effects that the generation amount of nitric oxide and fly ash is low, the energy consumption is reduced, and the solid waste treatment cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to garbage incineration technical field, specifically is a kind of garbage incinerator desulfurization environmental protection discharge device. BACKGROUND

[0002] The composition of municipal solid waste is influenced by seasonality and regionalism, and it fluctuates greatly, but the overall composition is relatively stable, mainly including rubber, paper, plastic, food waste and biomass waste, etc. The average moisture content is low, and the heat value is high. Therefore, the incineration method for treating municipal solid waste has been widely used.

[0003] Because the moisture content of kitchen waste is much higher than that of general municipal solid waste, the heat value is low, and it is difficult to ignite. The ordinary municipal solid waste incinerator is no longer suitable for it, and it is urgently needed to develop an energy-saving kitchen waste incinerator that can realize environmental protection emission.

[0004] In the prior art, in order to solve the above technical problems, the Chinese utility model patent application with the application number 202311575910.8 discloses an energy-saving combustion system of garbage incinerator, which includes a garbage incinerator, a sludge heating device, a garbage leachate tank, a water tank and a heat exchanger, etc. The sludge heating device is connected with the feed hopper of the garbage incinerator through a conveyor belt, and the heated sludge is input into the garbage incinerator for combustion. The hearth upper side wall of the garbage incinerator is provided with a pipe. The pipe includes a first pipe and a second pipe. The water tank is connected with the water inlet of the first pipe through a first water pump, and the water outlet of the first pipe is connected with the water tank to form a first heating water circulation. The water tank is connected with the water inlet of the second pipe through a second water pump, and the water outlet of the second pipe is connected with the sludge heating device. The sludge heating device is connected with the water tank to form a second heating water circulation. The pipe is installed on the inner side wall of the upper part of the hearth to absorb the local high temperature inside the hearth, prevent the coking phenomenon of the inner wall of the hearth caused by local high temperature, and effectively prolong the service life of the garbage incinerator. At the same time, the heat absorbed by the pipe is used to heat the sludge heating device, etc. Although the above technical solution effectively reduces the energy consumption of sludge drying, ensures the stable combustion of low-heat-value household garbage, sludge and garbage leachate without increasing the use of high-heat-value auxiliary fuel, and the dust and nitrogen oxide content in the flue gas generated by combustion is extremely low, which can be directly discharged, and the environmental protection benefit is remarkable. However, the nitrogen oxide emission pollution in the above technical solution is still serious, and therefore, it is still an urgent technical problem to reduce the emission of nitrogen oxides. UTILITY MODEL CONTENTS

[0005] The utility model aims at the deficiencies of the prior art, and provides a garbage incinerator desulfurization environmental protection discharge device, which can save solid waste treatment cost and reduce the generation of nitrogen oxides and energy consumption.

[0006] The technical solution adopted in this utility model is as follows: a desulfurization and environmental protection emission device for a waste incinerator, comprising a waste incinerator, a dry desulfurization tower, a dust collector, and a chimney. The flue gas emission pipe of the waste incinerator is connected to the dry desulfurization tower, the outlet of the dry desulfurization tower is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the chimney. A high-temperature heat exchanger and a low-temperature heat exchanger are sequentially installed on the flue gas pipe between the waste incinerator and the dry desulfurization tower. A branch recirculation pipe is installed on the pipe between the high-temperature heat exchanger and the low-temperature heat exchanger and connected to the inlet of the recirculation fan. The outlet of the recirculation fan is connected to each air chamber installed on the waste incinerator. The dry desulfurization tower includes a tower body and several tangential nozzles installed on the side of the tower body. The tangential nozzles are connected to an ejector. The high-pressure inlet of the ejector is connected to the outlet of the air compressor, and the ejector inlet is connected to the powder silo through a pipe.

[0007] The waste incinerator has several air chambers arranged in the lower part of the furnace. Each air chamber is equipped with a recirculated flue gas inlet, a primary air inlet, a primary baffle, and a secondary baffle. The primary baffle is located in the middle of the air chamber cavity and above the recirculated flue gas inlet. The primary air inlet is located on the bottom wall of the air chamber between the primary baffle and the secondary baffle.

[0008] A channel is formed between the primary baffle and the inner wall of the air chamber.

[0009] The edge of the primary baffle has a downward-bent section, which folds back and mixes the incoming circulating flue gas before it overflows from the channel, causing the circulating flue gas to form a fragmented flow after impacting the primary baffle.

[0010] The primary baffle is installed at 1 / 2 height of the air chamber, with a width of 1 / 2 the width of the air chamber at the same height, a downward tilt angle of 30-60 degrees, and a height from the bottom of 1 / 4 the total height of the air chamber.

[0011] The secondary baffle is installed on the side wall of the air chamber above the primary baffle, and a mixed gas channel is formed in the middle of the secondary baffle, which is connected to the furnace.

[0012] The secondary baffle is installed at 3 / 4 of the height of the air chamber and is divided into two parts, left and right, each with a width of 1 / 4 of the width of the air chamber at the same height.

[0013] The tangential nozzle is 60-80% of the total height from the bottom of the desulfurization tower; the number of tangential nozzles is 6-12, the tilt angle is 30-60 degrees, and the height from the bottom is 60%-80% of the total height.

[0014] In summary, compared with the prior art, the beneficial effects of this utility model are as follows: 10% of the total high-temperature flue gas is introduced and extracted into the flue and mixed with the primary air in the wind box. The high temperature and low oxygen content result in strong combustion and low nitrogen oxide generation. The high-temperature flue gas can increase the temperature of the primary air, reduce the amount of primary air heating steam used, and reduce energy consumption. The wind chamber is equipped with primary and secondary baffles. After the recirculated flue gas impacts the primary baffle, it forms a fragmented flow and is uniformly mixed with the primary air in the space between the primary and secondary baffles to form a high-temperature, low-oxygen gas. A sodium bicarbonate dry desulfurization tower is installed in the tail flue. The fly ash content in the desulfurized flue gas is low, saving on hazardous waste (fly ash produced by waste incinerators) treatment costs. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a flowchart of an environmentally friendly emission system for a waste incinerator according to the present invention;

[0017] Figure 2 This is a cross-sectional view of part AA. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] A desulfurization and environmental protection emission control device for a waste incinerator, such as Figure 1 As shown, it includes a waste incinerator 1, a high-temperature heat exchanger 2, a low-temperature heat exchanger 3, a dry desulfurization tower 4, a dust collector 9, and a chimney 8. The flue gas emission pipe of the waste incinerator 1 is connected to the dry desulfurization tower 4, the outlet of the dry desulfurization tower 4 is connected to the inlet of the dust collector 9, and the outlet of the dust collector 9 is connected to the chimney 8, discharging the purified waste gas. The high-temperature heat exchanger 2 and the low-temperature heat exchanger 3 are sequentially installed on the flue gas duct between the waste incinerator 1 and the dry desulfurization tower 4. A branch recirculation duct is installed on the duct between the high-temperature heat exchanger 2 and the low-temperature heat exchanger 3, connecting to the inlet of a recirculation fan 10. The outlet of the recirculation fan 10 is connected to various air chambers 12 installed on the waste incinerator 1. High-temperature flue gas, accounting for 10% of the total flue gas volume, is mixed with primary air in the air chambers 12 before entering the furnace for combustion, resulting in high furnace temperature, low oxygen content, intense combustion, and reduced nitrogen oxide generation. Cold water passes through a pipe in sequence through a low-temperature heat exchanger 3 and a high-temperature heat exchanger 2, where it is gradually heated to form steam for other uses.

[0021] The waste incinerator 1 has several air chambers 12 arranged in the lower part of the furnace. Each air chamber 12 is equipped with a recirculated flue gas inlet and a primary air inlet. High-temperature flue gas, accounting for 10% of the total volume, mixes with the primary air in the air chamber 12 and is then introduced into the furnace for combustion. Each air chamber 12 is equipped with a primary baffle 15 and a secondary baffle 13. The primary baffle 15 is located in the middle of the inner cavity of the air chamber 12 and above the recirculated flue gas inlet. A channel 14 is formed between the primary baffle 15 and the inner wall of the air chamber 12. Preferably, the edge of the primary baffle 15 has a downward-bent bend, which deflects and mixes the incoming recirculated flue gas before it overflows from the channel 14, causing the recirculated flue gas to impact the primary baffle 15 and form a fragmented flow, promoting a more uniform mixing of the combustion-supporting mixture. The secondary baffle 13 is located on the side wall of the air chamber 12 above the primary baffle 15, and a mixing gas channel is formed in the middle of the secondary baffle 13, communicating with the furnace. The primary air inlet is located on the bottom wall of the air chamber between the primary baffle 15 and the secondary baffle 13. The primary baffle 15 and secondary baffle 13 installed inside the air chamber 12 allow recirculated flue gas to collide with the primary baffle 15 and mix uniformly with the primary air in the space between the primary baffle 15 and the secondary baffle 13, forming a high-temperature, low-oxygen gas. The primary baffle 15 is installed at half the height of the air chamber 12, with a width half the width of the air chamber at the same height, a downward tilt angle of 30-60 degrees, and a height from the bottom of the air chamber that is 1 / 4 of its total height. The secondary baffle 13 is installed at three-quarters the height of the air chamber 12, divided into left and right sections, each with a width 1 / 4 the width of the air chamber at the same height.

[0022] The dry desulfurization tower 4, as described Figure 2 As shown, the system includes a tower body and several tangential nozzles 41 arranged on the side of the tower body. The tangential nozzles are connected to an ejector 5, the high-pressure inlet of which is connected to the outlet of an air compressor 7. The ejector inlet of the ejector 5 is connected to a powder silo 6 via a pipe, and the powder silo 6 contains baking soda powder. Preferably, there are 10 tangential nozzles 41, with an inclination angle of 45 degrees and a height from the bottom of the nozzles that is 70% of the total height of the desulfurization tower. High-pressure air draws in the baking soda powder through the ejector 5 and then enters the dry desulfurization tower 4 through the nozzles 41. In the dry desulfurization tower 4, the powdered baking soda reacts with the sulfides in the flue gas to undergo a desulfurization reaction. By installing a dry desulfurization tower 4 with baking soda in the tail flue, the fly ash content in the desulfurized flue gas is low, saving on hazardous waste (fly ash from waste incinerators) treatment costs.

[0023] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A desulfurization and environmental protection emission control device for a waste incinerator, characterized in that, The system includes a waste incinerator, a dry desulfurization tower, a dust collector, and a chimney. The flue gas emission pipe of the waste incinerator is connected to the dry desulfurization tower, the outlet of the dry desulfurization tower is connected to the inlet of the dust collector, and the outlet of the dust collector is connected to the chimney. A high-temperature heat exchanger and a low-temperature heat exchanger are sequentially installed on the flue gas pipeline between the waste incinerator and the dry desulfurization tower. A branch recirculation pipeline is installed on the pipeline between the high-temperature heat exchanger and the low-temperature heat exchanger and connected to the inlet of the recirculation fan. The outlet of the recirculation fan is connected to each air chamber installed on the waste incinerator. The dry desulfurization tower includes a tower body and several tangential nozzles installed on the side of the tower body. The tangential nozzles are connected to an ejector. The high-pressure inlet of the ejector is connected to the outlet of the air compressor, and the ejector inlet is connected to the powder silo through a pipeline.

2. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 1, characterized in that, The waste incinerator has several air chambers arranged in the lower part of the furnace. Each air chamber is equipped with a recirculated flue gas inlet, a primary air inlet, a primary baffle, and a secondary baffle. The primary baffle is located in the middle of the air chamber cavity and above the recirculated flue gas inlet. The primary air inlet is located on the bottom wall of the air chamber between the primary baffle and the secondary baffle.

3. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 2, characterized in that, A channel is formed between the primary baffle and the inner wall of the air chamber.

4. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 3, characterized in that, The edge of the primary baffle has a downward-bent section, which folds back and mixes the incoming circulating flue gas before it overflows from the channel, causing the circulating flue gas to form a fragmented flow after impacting the primary baffle.

5. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 4, characterized in that, The primary baffle is installed at 1 / 2 height of the air chamber, with a width of 1 / 2 the width of the air chamber at the same height, a downward tilt angle of 30-60 degrees, and a height from the bottom of 1 / 4 the total height of the air chamber.

6. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 5, characterized in that, The secondary baffle is installed on the side wall of the air chamber above the primary baffle, and a mixed gas channel is formed in the middle of the secondary baffle, which is connected to the furnace.

7. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 6, characterized in that, The secondary baffle is installed at 3 / 4 of the height of the air chamber and is divided into two parts, left and right, each with a width of 1 / 4 of the width of the air chamber at the same height.

8. The desulfurization and environmental protection emission control device for a waste incinerator according to claim 1, characterized in that, The tangential nozzle is 60-80% of the total height from the bottom of the desulfurization tower; there are 6-12 tangential nozzles with an inclination angle of 30-60 degrees.

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